Rotary-grate furnace.



J. MAOGORMAGK. ROTARY GRATE PURNAGE.

YH: Nonms PETERS co PHOTO-uwe wAsNlNsToN D c No. 724,025. PATENTBD MAR. 31, 1903.

J. MAOCORMACK'. l

ROTARY GRATE PURNACE.

APPLIOATION FILED lAPR. 9, 1902.

5 SHEETS-SHEET 2.

No MODEL.

Inventor M Witnesses No. 724,025. 1 PATENTED MAR. 31, 1903.

J. RMUGORIMIAK.V

ROTARY GRATE FURNAG.

APPLICATION FILED APE. 9, 1902.

N0 MODEL. 5 SHEETS-SHEET Y, VMMMMMMMMMMMMM MMMMMMMHMMMMMW4M MMMMM MMMMMMMMM Witneses: l Inventor 1 Attys.

PATRNTRD MAR. 3R 1903;

J. MAOCORMAGK. ROTARY GRATR PURNAGR.

A APPLIOATION FILED PR. N0 MODEL. A 9l 1902 5 SHEETS-snm? 4.

Inventor WIL -PATENTBD MAR. 31, 1903.,

' J. MAGGORMAGK.

ROTARY vGRATL PURITACE..

l6 SHEETS-SHEET' B.

In Ven tor UNirEn STATESN j vATENT Enron.

JOHN MACOORMAOK, OF BAYONNE, NEW JERSEY, AssIGNOR To ROYAL O. PEABODY, OF BROOKLYN, NEW YORK.

ROTARY-G RATE Fu RNAOE.

SPECFICATION forming part of Letters Patent Ne. 724,025, dated Meren e1, 1903.

Application led April 9, 1902. Serial No. 102,130. (No model.)

T0 all tch/0m 7125 may 'concern/.-

Be it known that I, JOHN MACCORMAOK, a citizen of the United States, residing at Bayonne, in the county of Hudson and State of New Jersey, have invented a certain new and useful Improvement'. in Rotary-Grate Furnaces, of which the following is a specification.

My invention relates to improvements in furnaces of the type employing rotary gratebars combined with automatic fuelfeedin,.,fv mechanism, and particularly to devices of the type employing a central fuel-magazine with 'a bank of rotary grate-bars on either side thereof.

My object is to provide an apparatus for the purpose which shall be simple in const-ruction and efficient in operation. v

To this end the invention consists, in the first place, of a longitudinally-arranged fuelmagazine having fuel-feeding devices therein, a bank of rotary grate-bars on either side Vof said fuel-magazine, al grate-surface cop- 4erating with each bank of grate-bars for recelving and breaking the clinkers delivered from the same, and improved mechanism for simultaneously rotating said grate-bars, -z whereby the fuel delivered from the maga-l` able, the invention consists, in the second place, of utilizing the rotations of the feedscrew for eectingthe necessary feed move- -ments of the grate-bars.

The invention consists, in the third place, of surrounding the f nel-magazine with a windbox and in interposing between the fuelmagazine and wind-box a series of sectional bolsters, above each set of which is mounted one of the rotating grate-bars to thereby constitute a hollow rotating twyer;

Fourthly, the invention consists in a novel arrangement of dumping grates combined with each bank of hollow rotating grate-bars and mechanism for operating the former, whereby clinkers deposited on said dumpinggrates from the grate-bars can be broken up and dumped into the ash-pit.

Finally, the invention consists in further the line 2 2 of Fig. l; Fig. 3, across-sectional Y.

view on the line 3 3 of Fig. 2; Fig. 4, a section On the line 4 4. of Fig. 2', illustrating particularly the preferred mechanism for driving the rotating grate-bars; Fig. 5, a section on the line 5 5 of Fig. 4; Fig. 6, an elevation of the front bearing-plate and bearings for the rotating grate-bars; and Fig. 7, a longitudinal sectional View through the dumpinggrates, showing the mechanism for operating the same.

In all of the above views corresponding parts are represented by the same numerals of reference.

The furnace is provided with side Walls l l, with a front Wall 2, and with a bridge-wall 3, as usual. Mounted on the floor ,of the ashpit is a wind-box 4, in which is carried a fuelmagazine 5 by means of suitable supportingbrackets 6. Located between the fuel-magazine and the side walls of the wind-box are a series of sectional bolsters 7, forming a plurality of orifices through which air from the wind-box may pass. These bolsters rest in place by their weight, so as to be readily removable. The stoker which I prefer to use and that which is illustrated is one employing a feed-screw for projecting the fuel into the magazine and piling it up over the sides ofthe same. In this case, therefore, the magazine is provided with a rounded bottom, and

extending in line therewith is a tubular tun-4 nel 8, passing through thefront Wall 2 and provided outside of the furnace with a hopper 9, to which the fuel is supplied. Passing through the tunnel 8 and projecting intov the fuel-magazine is the feed-screw l0, operated from a motor 11 of any suitable type. The wind-box is provided with a door l2 in its side (see Fig. 2) for cleaning out the same when desired.

Mounted in the bridge-wall 3 is a bearingplate 13 and in the front wall 2 a bearingplate 14, having bearings 15 therein.

Rotatably mounted in the bearings of these plates are the shafts 16 of the rotating grate-bars 17, the latter being preferably circular in crosssection with perforated peripheries, so that air may pass from the ash-pit upwardly through the same. It will be noted that one of the rotating grate-bars is located vertically above each line of sectional bolsters, so that air may pass from the wind-box directly upward through the grate-bars in question, whereby the latter will constitute hollow rotary twyers for protecting the sides of the fuel-magazine. The ends of the fuel-magazine are provided with ordinary stationary twyers 1S. (See Fig. 2.) W'hen a stoker is used having a feed-screw 10, the latter preferably drives the rotating grate-bars through a worm-gear 19, generally clovershaped,'as shown, mounted on a shaft 20, said wormgear passing through a slot cut in the upper wall of the tunnel 8. The shaft 20 carries a sprocket-wheel 21, which through a sprocketchain 22 drives a sprocket-wheel 24 on a shaft 25, carried in brackets 26, cast integrally with the bearing-plate 14. The shaft 25 connects at each end by bevel-gears 27 or other mechanical device with a sectional worm-shaft 28, mounted in bearings 29 on the bearing-plate 14. The Worms mesh with and drive wormwheels 30 on the shafts of the rotating gratebars, as shown. By making the worm-shaft 28 of sections, as illustrated, one of its sections can be removed when worn without disturbing the other sections. It will be noted that the driving mechanism for the rotating grate-bars is arranged in front of the bearingplate 14 within the front wall 2, so as to be removed from the direct effect of the fire.

Mounted at the outside of each bank of rotating grate bars are grates for receiving clinkers deposited thereon from said gratebars and which grates may be of any suitable construction. I illustrate as a convenient embodiment of the invention a series of dumping-grates 31, each section being mounted on trunnions 32 and being provided with a downwardly-projecting arm 33, with which a link 34 connects. These links pass through the front of the furnace and are connected with levers 35, by which they may be operated to dump the grates.

The operation of my improved furnace, assuming the fire to have been started, is as follows: Fuel is supplied to the hopper 9 and by means of the feed-screw 10 is forced into the ward each side of the furnace, in which travel` the fuel will be subjected to the effect `of air passing up through the ash-pit and thence through the grate-bars, so as to be entirely consumed. Clinkers will be deposited on the grate-surfaces 31 and can be broken up and dumped into the ash-pit by operating the levers 35. It will be understood, of course, that a forced draft can be applied to the wind-box 4 and also to the ash-pit below the grate-bars or that natural draft alone can be relied upon.

Having now described my invention, what I claim as new, and desire to secure by Letters Patent, is as follows:

1. In a furnace, the combination with a fuelmagazine, a wind-box surrounding the same, and perforated holsters interposed between the wind-box and magazine, of rotating hollow twyers located above said bolsters and receiving air projected through the same, substantially as set forth. 4

2. In afurnace, the combination with afuelmagazine, a wind-box surrounding the same, and sectional perforated holsters interposed between the wind-box and magazine, of rotating hollow twyers located above said bolsters and receiving air projected through the same, substantially as set forth.

3. In a furnace, the combination with a fuelmagazine, a feed-screw in said magazine, and a set of rotating grate-bars at the side of said magazine, of a worm-gear engaged by said feed-screw, and connections between said worm-gear and said grate-bars, substantially as set forth.

4. In a furnace, the combination with afuelmagazine, a feed-screw in said magazine, and a set of hollow rotating grate-bars at the side of said magazine, of a worm-gear engaged by said feed-screw, and connections between said worm-gear and said grate-bars, substantially as set forth.

5. In a furnace, the combination with a fuelmagazine, a feed-screw mounted in said magazine, and a set of rotating grate-bars on each side of said magazine, of a worm-gear engaged by said feed-screw, and connections between said worm-gear and the grate-bars for rotating the latter, substantially as set forth.

6. In afurnace, the combination withafuelmagazine, a feed-screw mounted in said magazine, and a set of rotating grate-bars on each side of said magazine, of a worm-gear engaged by said feed-screw, and connections between said worm-gear and the grate-bars for continuously rotating the latter, substantially as set forth.

7. In a furnace, the combination with a fuelmagazine, a feed-screw in said magazine, and a series of rotating grate-bars at the side of said magazine, of a worm-shaft for simultaneously rotating said grate-bars, a worm-gear engaging with said feed-screw, and connections between said worm-gear and said wormshaft, substantially as set forth.

S. In a furnace, the combination with a fuelmagazine, a feed-screw in said magazine, and a series of rotating grate-bars at the side of said magazine, of a sectional worm-shaft for IDO IIO

' gear engaging with said feed-screw,a sprocket- Wheel rotated by said Worin gear, and a sprocket-chain between said sprocket-Wheels, substantially as set forth. n

This specification signed and witnessed this 15 4th day of April, 190

JOHN MACCORMAOK. Witnesses:

FRANK L. DYER',

JNO. ROBT. TAYLOR. 

